In this paper we shall demonstrate how a polyphasecoded radar waveform can be implemented using a continuous phase modulation (CPM) framework so as to achieve spectral containment while maintaining a constant envelope to maximize energy-on-target. Current modulation techniques such as derivative phase shift keying (DPSK) and minimum shift keying (MSK), which are applicable to binary-coded waveforms, are well-known implementation schemes for spectral containment. The CPM implementation is applicable to polyphase codes and can also achieve better spectral containment, though a byproduct is increased range sidelobes that result due to the deviation from the idealized code (implicitly defined for squared-shaped chips). To ameliorate the increased range sidelobes, a version of Least-Squares mismatched filtering is employed that accommodates the continuous nature of the CPM structure. Also, continuous rise/fall-time transitions of the pulse are addressed as part of the holistic implementation of the CPM-based waveform. It is observed that for the CPM implementation the rise/fall-time becomes the limiting factor on spectral containment and a rather simple scheme based on Chireaux out-phasing is suggested as a means to "slow down" the pulse rise/fall.
Twenty-first century littoral and open-sea missions present US Navy (USN) shipboard-radar systems with the challenge of detecting small targets in severe clutter and against multiple sources of interference. In Fiscal Year 2006) (FYOO), the Office of Naval Research (ONR) sponsored a program to develop an active array radar that includes a digital beamforming (DBF) architecture. The DBF radar system has the potential for improved time-energy management, improved signal-to-clutter (SIC) ratios, improved reliability and reduced life-cycle costs. This paper summarizes the latest developments of the program during FYOO. PROGRAM BACKGROUND In FYOO, ONR sponsored the Digital Array Radar (DAR) program, to develop state-of-the-art technologies for insertion. into an active-array radar system with a full DBF architecture. Three organizations have been involved: MULL, NRUDC and NSWCIDD. This paper presents the work performed in this program during FYOO and provides some hardware test results from each organization. USN RADAR CHALLENGES IN THE 21" CENTURY USN operations in both littoral and open-sea areas continued to grow in complexity during the last decade. Land clutter, multiple jammers, and commercial wireless links across the globe present increasing challenges to current radar This work is sponsored by the Office of Naval Research (ONR) and is managed in part by NRL under Navy program element number 62232N during WOO. All opinions, interpretations, conclusions, and recommendations presented are those of the authors and are not necessarily endorsed by the United States Navy.
Twenty-first century littoral and open-sea missions present US Navy (USN) shipboard-radar systems with the challenge of detecting small targets in severe clutter and against multiple sources of interference. In Fiscal Year 2006) (FYOO), the Office of Naval Research (ONR) sponsored a program to develop an active array radar that includes a digital beamforming (DBF) architecture. The DBF radar system has the potential for improved time-energy management, improved signal-to-clutter (SIC) ratios, improved reliability and reduced life-cycle costs. This paper summarizes the latest developments of the program during FYOO. PROGRAM BACKGROUND In FYOO, ONR sponsored the Digital Array Radar (DAR) program, to develop state-of-the-art technologies for insertion. into an active-array radar system with a full DBF architecture. Three organizations have been involved: MULL, NRUDC and NSWCIDD. This paper presents the work performed in this program during FYOO and provides some hardware test results from each organization. USN RADAR CHALLENGES IN THE 21" CENTURY USN operations in both littoral and open-sea areas continued to grow in complexity during the last decade. Land clutter, multiple jammers, and commercial wireless links across the globe present increasing challenges to current radar This work is sponsored by the Office of Naval Research (ONR) and is managed in part by NRL under Navy program element number 62232N during WOO. All opinions, interpretations, conclusions, and recommendations presented are those of the authors and are not necessarily endorsed by the United States Navy.
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